3640 series - PU foam based pyramid absorbers

These PU foam bases pyramide absorbers are the most popular solution for 3m, 5m and 10m EMC chambers in the market.

Solution for 3m, 5m and 10m EMC chambers in the market

These absorbers are the most popular solution for 3m, 5m and 10m EMC chambers in the market. They are composed of pyramidal, full tip SAM or truncated SMT pulsing the matching layer to separate the pyramidal part from the ferrite part. Through optimization, this product has a superb performance across 30MHz to 18GHz. The ferrite performes from 30MHz to 1GHz and the foam performes above 1GHz.

Prototypes are made and the design is tested. Results become part of a valuable feedback loop for refining our design further.

Broadband Pyramidal Absorber is a low density polyurethane foam, filled with high loss dielectric material in open cell structure and finished with blue paint.

The general base size is 60cm x 60cm with 50mm to 1200mm height pyramidal. It’s flexible and light weight, can be attached on the wall easily. It is a high performance broadband RF absorber and widely used for Anechoic Chambers.

Example image of 3640-300 (300 mm height PU foam based puramid absorber)
3640-300 (300 mm height PU foam based puramid absorber)

Charactaristics

  • Such absorbers have a pyramid-shaped appearance, with blue color (it can be selected as request)
  • Pliable and flexible, the pyramids won’t bend in long-term use, and its absorbing properties won’t be changed within 10 years.
  • Oxygen index ≥29% (GB/T2406-93), which belongs to flame retardant B2 level (GB8624-1997)
  • Good environmental performance, all raw materials can meet the environmental requirements, no volatile, no smell and non-toxic.
  • Working conditions: general indoor application
    • Long-time working temperature: -50°C ~ 90°C
      Short-time working temperature: -100°C ~ 120°C
    • Relative humidity: 55% ± 15%
      Frequency range: 30MHz ~ 110GHz

Installation method

Generally an environmental protective adhesive is used to paste the absorbers on the shield body (inside of the Faraday cage); when the absorbers’ height is below 500mm, Velcro installation can be applied; furthermore, we can also adopt the fasteners to install the absorbers, which would facilitate the replacement of absorbers and the relocation of chambers.


Schematic diagram of PU foam based microwave absorbers

Technical drawing of PU foam based pyramid absorbers
Technical drawing of PU foam based pyramid absorbers

Product specification and part numbers

Part number Base size (mm*mm) Pyramid quantity per unit Unit size A*C*B (mm*mm*mm* Standard weight (kg/m2)
3640-50 500 x 500 900 50 x 20 x 10 1.5
3640-96 600 x 600 225 96 x 36 x 20 2.2
3640-190 81 190 x 65 x 50 4
3640-300 36 300 x 100 x 60 7
3640-495 16 495 x 145 x 65 11
3640-700 9 700 x 195 x 130 16
3640-1000 300 x 300 1 1000 x 300 x 150 22
3640-1200 400 x 300 1 1200 x 400 x 200 25

Reflection loss / Shielding performance

These values are measured under laboratory conditions.
In your situation results may differ, please read our Guarantee
Part number Reflection loss under
vertical incidence (-dB @ GHz)
Power handling
capacity
0.03 0.08 0.3 0.5 1 3 6 10 18 40 100 kW/m2
3640-50              30 35 40 50 45  1.5
3640-96            30 35 40 45 50 45  1.5
3640-190         27 35 40 45 50 50 48  1.5
3640-300       25 35 40 50 50 50 50 47  1.5
3640-495     20 30 40 45 50 50 50 50 48  1.5
3640-700   8 25 35 40 50 50 50 50 50 48  1.5
3640-1000   11 30 40 45 50 50 50 50 50 47  1.5
3640-1200 5 13 35 40 50 50 50 50 50 50 47  1.5

Please note:

  • For the data below 500MHz, it is obtained by low-frequency coaxial test method (GJB5239-2004); while for the data above 1GHz, it is obtained by far-field RCS test method (GJB2038A-2011)
  • The performance data listed in the above table is the guaranteed data, and the measured data would be equal to or better than the guaranteed data.
  • The bold part number is a stock item and can be delivered immediately
  • Certification: CE ROHS

 

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Series
PU foam based pyramid absorbers with a height of 300 mm can be delivered from stock
* Note: The red blocks are required
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